@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix ns0: <http://gcmd.gsfc.nasa.gov/kms#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/ecd58f82-8f96-45e1-9547-dd4a02291bd9>
  skos:prefLabel "Spectrometers/Radiometers"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/337c284f-3158-48e5-8050-5d2744ba77a7> .

<https://gcmd.earthdata.nasa.gov/kms/concept/337c284f-3158-48e5-8050-5d2744ba77a7>
  skos:changeNote """2020-04-14 15:30:51.0 [tstevens] Insert Concept 
add broader relation (SpEx [337c284f-3158-48e5-8050-5d2744ba77a7,559945] - Spectrometers/Radiometers [ecd58f82-8f96-45e1-9547-dd4a02291bd9,546159]); 
""", """2020-04-14 15:31:53.0 [tstevens]  
insert AltLabel (id: null
category: primary
text: Spectral Aerosol Extinction
language code: en); 
insert Definition (id: null
text: We introduce a new instrument for the measure-ment  of  in  situ  ambient  aerosol  extinction  over  the  300–700 nm  wavelength  range,  the  spectral  aerosol  extinction(SpEx)  instrument.  This  measurement  capability  is  envi-sioned  to  complement  existing  in  situ  instrumentation,  al-lowing  for  simultaneous  measurement  of  the  evolution  ofaerosol optical, chemical, and physical characteristics in theambient environment. In this work, a detailed description ofthe instrument is provided along with characterization testsperformed in the laboratory. Measured spectra of NO2andpolystyrene latex spheres (PSLs) agreed well with theoreti-cal calculations. Good agreement was also found with simul-taneous  aerosol  extinction  measurements  at  450,  530,  and630 nm using CAPS PMex instruments in a series of 22 testsincluding  nonabsorbing  compounds,  dusts,  soot,  and  blackand brown carbon analogs. SpEx measurements are expectedto help identify the presence of ambient brown carbon dueto its 300 nm lower wavelength limit compared to measure-ments  limited  to  longer  UV  and  visible  wavelengths.  Ex-tinction spectra obtained with SpEx contain more informa-tion than can be conveyed by a simple power law fit (typ-ically represented by Ångström exponents). Planned futureimprovements  aim  to  lower  detection  limits  and  ruggedizethe instrument for mobile operation
language code: en); 
""" ;
  ns0:altLabel [ ] ;
  skos:definition "We introduce a new instrument for the measure-ment  of  in  situ  ambient  aerosol  extinction  over  the  300–700 nm  wavelength  range,  the  spectral  aerosol  extinction(SpEx)  instrument.  This  measurement  capability  is  envi-sioned  to  complement  existing  in  situ  instrumentation,  al-lowing  for  simultaneous  measurement  of  the  evolution  ofaerosol optical, chemical, and physical characteristics in theambient environment. In this work, a detailed description ofthe instrument is provided along with characterization testsperformed in the laboratory. Measured spectra of NO2andpolystyrene latex spheres (PSLs) agreed well with theoreti-cal calculations. Good agreement was also found with simul-taneous  aerosol  extinction  measurements  at  450,  530,  and630 nm using CAPS PMex instruments in a series of 22 testsincluding  nonabsorbing  compounds,  dusts,  soot,  and  blackand brown carbon analogs. SpEx measurements are expectedto help identify the presence of ambient brown carbon dueto its 300 nm lower wavelength limit compared to measure-ments  limited  to  longer  UV  and  visible  wavelengths.  Ex-tinction spectra obtained with SpEx contain more informa-tion than can be conveyed by a simple power law fit (typ-ically represented by Ångström exponents). Planned futureimprovements  aim  to  lower  detection  limits  and  ruggedizethe instrument for mobile operation"@en ;
  skos:prefLabel "SpEx"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/ecd58f82-8f96-45e1-9547-dd4a02291bd9> ;
  a skos:Concept .